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--- public:network_connection [2016-09-14 12:59] – krest
+++ public:network_connection [2016-09-14 13:06] – krest
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 ==== How to differentiate malfunctions in network services ====
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+Loss of network connectivity can manifest itself in different ways: logon failure due to inaccessible domain controller, no internet connection, mail server inaccessible, network resources inaccessible etc. Computer networking is structured in so called layers (https://en.wikipedia.org/wiki/OSI_model), where ** layer 1 ** is the physical layer, which is practically the physical connection, a cable. Although you can't trace completely the whole physical route, at least you can first check the connection of your device to the network socket via a UTP cable, provided you are connected by a cable to the network. If you notice that your device has no network connectivity (see "Check connectivity" ) check the cable first.